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Can i use 1 8gb memory can I use 1 8GB card instead of 2 4GB
Yes RAM Type:PC3-10600 DDR3Min. RAM Speed:1333 MHz Details:Supports 1333 MHz PC3-10600 DDR3 SDRAM. Standard RAM:4 GBMaximum RAM:16 GB* Details:4 GB of RAM is installed as two 2 GB modules, no slots free.
*Apple officially supports a maximum of 8 GB of RAM, but as first confirmed by OWC, this model actually is capable of using up to 16 GB of RAM with two 8 GB memory modules.